Template:Ref-O'RahillyBoyden1973
From Embryology
O'Rahilly R. and Boyden EA. The timing and sequence of events in the development of the human respiratory system during the embryonic period proper. (1973) Z. Anat. Entw., 141: 237-250.
O'Rahilly R. and Boyden EA. The timing and sequence of events in the development of the human respiratory system during the embryonic period proper. (1973) Z. Anat. Entw., 141: 237-250.